I'm kind of curious about this myself.
I have quite a bit of money stashed in my bank back in the US and for the most part, I don't need to touch it right now, but there have been a few times when I've had to make a trip to the Bank of China to pull some of it out at the ATM.
If the Yuan appreciates against the dollar, I guess that means I should withdrawl some of my funds from the US before it happens?
You must be thinking of some sizable sum, otherwise any gains could be offset by transaction fees.